Development of Speech Intelligibility Between 30 and 47 Months in Typically Developing Children: A Cross-Sectional Study of Growth
Publication: Journal of Speech, Language, and Hearing Research
Volume 63, Number 6
Pages 1675-1687
Abstract
Purpose
We sought to establish normative growth curves for intelligibility development for the speech of typically developing children as revealed by objectively based orthographic transcription of elicited single-word and multiword utterances by naïve listeners. We also examined sex differences, and we compared differences between single-word and multiword intelligibility growth.
Method
One hundred sixty-four typically developing children (92 girls, 72 boys) contributed speech samples for this study. Children were between the ages of 30 and 47 months, and analyses examined 1-month age increments between these ages. Two different naïve listeners heard each child and made orthographic transcriptions of child-produced words and sentences (n = 328 listeners). Average intelligibility scores for single-word productions and multiword productions were modeled using linear regression, which estimated normal-model quantile age trajectories for single- and multiword utterances.
Results
We present growth curves showing steady linear change over time in 1-month increments from 30 to 47 months for 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentiles. Results showed that boys did not differ from girls and that, prior to 35 months of age, single words were more intelligible than multiword productions. Starting at 41 months of age, the reverse was true. Multiword intelligibility grew at a faster rate than single-word intelligibility.
Conclusions
Children make steady progress in intelligibility development through 47 months, and only a small number of children approach 100% intelligibility by this age. Intelligibility continues to develop past the fourth year of life. There is considerable variability among children with regard to intelligibility development.
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Information & Authors
Information
Published In
Journal of Speech, Language, and Hearing Research
Volume 63 • Number 6 • June 2020
Pages: 1675-1687
PubMed: 32459133
Copyright
Copyright © 2020 American Speech-Language-Hearing Association.
History
- Received: Jan 9, 2020
- Revised: Feb 7, 2020
- Accepted: Feb 12, 2020
- Published online: May 27, 2020
- Published in issue: Jun 22, 2020
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